中文摘要：

通过野外调查和营养液培养，证明Zn超富集植物长柔毛委陵菜（Potentilla griffithii var．velutina）无论在自然条件下还是营养液培养条件下，都对Cd具有很强的耐性和富集能力，是一种潜在的重金属Cd超富集植物。自然条件下生长于铅锌矿区的长柔毛委陵菜，其根系土壤Cd总量为101—1331mg·kg^-1，平均320mg·kg^-1；植物Cd含量叶片为39-765mg·kg^-1，平均178mg·kg^-1，叶柄为64-1422mg·kg^-1，平均280mg·kg^-1；Cd转运系数为0．64—1．18，平均值0．84；生物富集系数为0．22—1．68，平均0．80。营养液培养条件下，长柔毛委陵菜在Cd浓度≤20mg·L^-1的介质中能够正常生长；植物叶片、叶柄及根部Cd含量随介质中Cd浓度的增大而增大，叶和柄中Cd含量在60mg·L^-1的Cd处理时都达到最大，分别为1604和6145mg·kg^-1；不同组织的Cd含量顺序为根〉柄〉叶；体内累积的Cd有60％以上储存在地上部。营养液培养的Cd转运系数小于自然状况。

英文摘要：

Field survey and hydroponic experiments were conducted to confirm that Potentilla griffithii var. velutina, a new Zn-hyperaccmulator, have strong Cd tolerance and accumulating capacity not only in natural environment but in hydroponics, and it can be identified as a potential Cd-hyperacumulator. Cadmium concentration in leaves and leafstalks of P. griffithii var. velutina grown in Pb/Zn mining soils averaged 178 mg·kg^-1 （39-765 mg·kg^-1） and 280 mg·kg^-1 （64-1 422 mg·kg^-1）, respectively. The fact that P. griffithii var. velutina was able to grow in a mining soil with a Cd concentration of 1 331 mg·kg^-1 without showing any phytotoxicity demonstrated its high tolerance to Cd. The translocation factor and bioaccumulation factor for Cd averaged 0.84 （0.64-1.18） and 0.80 （0.22-1.38）, respectively. The hydroponics results showed that no reduction in dry matter yields was noted when the plants were grown at Cd supply levels up to 20 mg·kg^-1 in nutrient solution. The concentration of Cd in leaves, leafstalks and roots increased with the Cd supply, and reached a maximum of 1 604 and 6 145 mg·kg^-1 in leaves and leafstalks at 60 mg·kg^-1 Cd, respectively. The Cd concentration in different parts of the plant was in the order： roots〉leafstalks〉 leaves, however, more than 60% of the total Cd accumulated was translocated to the shoots in hydroponics. The Cd translocation factor in hydroponics was lower than that in natural environment.